Atapi,
Take a look at
www.lasolastech.com/demo, and look at the Search for Homes link. I piped that in using Wrapper. Some sites might have framebusters, so bringing in Realtor.com might not be the best solution (although I never tried it). Try using your local realtor board's MLS site if they have (I used
http://ragflrealtor.com).
Hope this helps. Send me an e-mail if you have any other questions.
-Jeff